python: configure uv to use the python interpreter from the profile

[sandydoo]

Now that we correctly wrap python to support Nix-provide libraries, we should revisit setting UV_PYTHON.

Follow up to #1959, #1999, and #2024.

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Last updated: 2025-12-10T15:18:46.074Z

[domenkozar]

We should add a test because it's very fragile around this code.